Al-Mg ALUMINUM ALLOY SHEET FOR HIGH STRAIN-RATE SUPERPLASTIC FORMING

摘要

PROBLEM TO BE SOLVED: To provide an Al-Mg aluminum alloy sheet having high strength after being superplastically formed with high strain rate, and superior high strain rate superplastic formability, particularly for a use in a vehicle body panel.;SOLUTION: The Al-Mg aluminum alloy sheet for high strain rate superplastic-forming comprises 3.5-7.0% Mg, more than 0.5% but 1.0% or less Cu, 0.001-0.1% Ti, Si and Fe each limited to 0.2% or less, 0.1% or less Mn and the balance Al with unavoidable impurities; and has a 0.2% yield stress of 150 MPa or higher, after having been subjected to heat treatment of holding the sheet at 500°C for three minutes and radiationally cooling it to room temperature and then further to an artificial aging.;COPYRIGHT: (C)2005,JPO&NCIPI